21111201112020 has 24 divisors (see below), whose sum is σ = 59111363113824. Its totient is φ = 5629653629856.

The previous prime is 21111201112009. The next prime is 21111201112063. The reversal of 21111201112020 is 2021110211112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175926675874 + ... + 175926675993.

It is an arithmetic number, because the mean of its divisors is an integer number (2462973463076).

Almost surely, 2^{21111201112020} is an apocalyptic number.

21111201112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111201112020 is an abundant number, since it is smaller than the sum of its proper divisors (38000162001804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111201112020 is a wasteful number, since it uses less digits than its factorization.

21111201112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351853351879 (or 351853351877 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21111201112020 its reverse (2021110211112), we get a palindrome (23132311323132).

The spelling of 21111201112020 in words is "twenty-one trillion, one hundred eleven billion, two hundred one million, one hundred twelve thousand, twenty".